[pass] pass edit: infinite loop

[Brian Mattern]

If gpg fails for any reason (such as a public key being unverified), then
"pass edit" will enter an infinite loop of retrying encryption (with a 1
sec sleep in between).

I can't think of a case where encryption would succeed the second time
after failing the first. Perhaps we should replace this loop with a
warning and an option to print the password contents to screen before
exiting?

Brian